Aerodynamic, comfortable, and breathable, the 509 Sullivan Helmet is ready to pack on the miles, no matter your riding experience. This DOT-compliant helmet has a wide field of view, comes in a range of sizes, and has been made with a durable, high-quality thermoplastic shell. Our multi-channel ventilation system allows for maximum air flow while a classic padded chin strap with a D-ring closure keeps it secure.